EP0538311B1 - Shaftless open-end spinning rotor of an axial combined magnetic/gas bearing - Google Patents

Shaftless open-end spinning rotor of an axial combined magnetic/gas bearing Download PDF

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Publication number
EP0538311B1
EP0538311B1 EP91912504A EP91912504A EP0538311B1 EP 0538311 B1 EP0538311 B1 EP 0538311B1 EP 91912504 A EP91912504 A EP 91912504A EP 91912504 A EP91912504 A EP 91912504A EP 0538311 B1 EP0538311 B1 EP 0538311B1
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EP
European Patent Office
Prior art keywords
magnets
spinning rotor
open
end spinning
rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91912504A
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German (de)
French (fr)
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EP0538311A1 (en
Inventor
Björn Lind
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF Textilmaschinen Komponenten GmbH
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SKF Textilmaschinen Komponenten GmbH
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Publication of EP0538311A1 publication Critical patent/EP0538311A1/en
Application granted granted Critical
Publication of EP0538311B1 publication Critical patent/EP0538311B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C39/00—Relieving load on bearings
    • F16C39/06—Relieving load on bearings using magnetic means
    • F16C39/063—Permanent magnets
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/04—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface
    • D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
    • D01H4/12—Rotor bearings; Arrangements for driving or stopping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0402—Bearings not otherwise provided for using magnetic or electric supporting means combined with other supporting means, e.g. hybrid bearings with both magnetic and fluid supporting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2340/00—Apparatus for treating textiles
    • F16C2340/18—Apparatus for spinning or twisting

Definitions

  • the invention relates to an OE spinning rotor according to the preamble of claim 1 for high speeds and short acceleration and deceleration times.
  • Such shaftless spinning rotors are known from EP-PS 190 440, in which an axial gas bearing with paired permanent magnets for guiding and driving are combined.
  • the spinning rotor is also the rotor of a drive motor.
  • the decisive advantages are wear-free storage and easy interchangeability. With increasing rotor speeds, the rotor diameter must be reduced. This leads among other things also to smaller ring gaps, e.g. between the rotor and the housing, which must not come into contact with the rotor even in critical running conditions during the run-up and braking phase.
  • the object of the invention is to eliminate these disadvantages and to provide a shaftless OE spinning rotor for an axial gas bearing with high guide rigidity and a mounting of the drive magnets which is rotationally fixed up to the highest ranges with the smallest possible mass and low moment of inertia.
  • the OE spinning rotor according to the preamble of claim 1 fulfills this task by the characterizing features of claim 1.
  • the required guide rigidity is achieved by the combination of holding magnets and centering magnets and the centrifugal anchorage of the magnets by fixing them with a high-strength material, the use of dielectric carbon fiber reinforced laminates is particularly advantageous.
  • the shaftless OE spinning rotor as shown in the section in FIG. 1, carries the passive elements for the drive and the elements for storage on a combined magnetic gas bearing.
  • this includes the combination of a disk-shaped permanent magnet 3 as a holding magnet and an annular permanent magnet arranged concentrically to this 4 as a centering magnet, which are magnetically separated by a spacer ring 5.
  • two concentric permanent magnets 4, which are also separated by a spacer ring 5 can also be provided.
  • the holding and centering magnets i.e. permanent magnets 3 and 4 are attracted by congruent permanent magnets of opposite polarity in a device, not shown, for driving and supporting the shaftless OE spinning rotor.
  • These permanent magnets are therefore arranged in pairs to one another. The distance between these pairs is formed by a bearing gap of the combined magnetic gas bearing.
  • the outer surface of the OE spinning rotor on the drive side 2 forms a very smooth bearing surface 6 made of multi-layer laminates 7a, which are reinforced by carbon fibers 8 changing fiber direction.
  • thin permanent magnets 9 are arranged in pairs, point symmetrically and with changing polarity as drive magnets in the outer region of the drive part 2.
  • These drive magnets are preferably formed as segments, the ends 10 of which extend radially or are curved in an arc.
  • an inner spacer molding 14 (FIG. 3) of high strength is introduced radially between the magnets 3, 4 and the magnets 9 with the same thickness as the magnets 3, 4, 9 and recesses 16, 17 corresponding to the shapes of these magnets.
  • the Spacer molding 14 can also consist of carbon fiber reinforced laminates with changing fiber direction 15. Thus, the laminate 7a does not have to take up the centrifugal forces of the drive magnets 9 or those of the spacer 14.
  • Circular disk-shaped fixed laminates 7a, 7b extend over all magnets 3, 4, 9 and the spacer molding 14 and hold the magnets and the spacing molding securely even at the highest speeds. It is expedient that the OE spinning rotor has markings (18) on its outer circumference for detecting the rotor position by means of sensors if the OE spinning rotor is driven by a brushless axial field motor.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Abstract

A shaftless open-end spinning rotor, designed as a rotor of an axial field motor, and a stator have plane, parallel bearing surfaces for a combined magnetic/gas bearing. Magnets which guide and drive the spinning rotor are incorporated in the bearing surface. The drive magnets possess high rigidity during guiding and are supported in a torsionproof manner even at the highest rotational speeds. To this end, the spinning rotor (1) is guided by thin, concentric, disk-shaped and annular permanent magnets (3, 4) each of alternating polarity which are disposed in the centre of the drive side (2), and driven by thin permanent magnets (9) arranged in pairs point-symmetrically and with alternating polarity. All magnets (3, 4, 9) are supported on the spin rotor (1) by a high-strength material.

Description

Die Erfindung betrifft einen OE-Spinnrotor gemäß Oberbegriff des Anspruches 1 für hohe Drehzahlen und kurze Hochlauf- und Abbremszeiten. Derartige schaftlose Spinnrotoren sind durch die EP-PS 190 440 bekannt, bei denen ein Axialgaslager mit paarig angeordneten Permanentmagneten für die Führung und den Antrieb vereint sind. Der Spinnrotor ist gleichzeitig Läufer eines Antriebsmotors. Entscheidende Vorteile sind die verschleißfreie Lagerung und die einfache Austauschbarkeit. Bei steigenden Rotordrehzahlen ist der Rotordurchmesser zu reduzieren. Dies führt u.a. auch zu kleineren Ringspalten, z.B. zwischen Botor und Gehäuse, bei denen es auch in kritischen Laufzuständen während der Hochlauf- und Abbremsphase nicht zum Berühren des Rotors kommen darf. Die Führungssteifigkeit der bisher bekannten schaftlosen OE-Spinnrotoren war unzureichend, so daß es kritische Drehzahlbereiche mit unzulässigen Taumel- und Schwingbewegungen gab. Bei sehr hohen Drehzahlen gab es auch Rotorbrüche, weil die Haltekräfte für die in Aussparungen des Spinnrotors eingesetzten Antriebsmagnete von den Rotorwänden nicht mehr zusätzlich zu ihren inneren Fliehkraftspannungen aufgenommen werden konnten.The invention relates to an OE spinning rotor according to the preamble of claim 1 for high speeds and short acceleration and deceleration times. Such shaftless spinning rotors are known from EP-PS 190 440, in which an axial gas bearing with paired permanent magnets for guiding and driving are combined. The spinning rotor is also the rotor of a drive motor. The decisive advantages are wear-free storage and easy interchangeability. With increasing rotor speeds, the rotor diameter must be reduced. This leads among other things also to smaller ring gaps, e.g. between the rotor and the housing, which must not come into contact with the rotor even in critical running conditions during the run-up and braking phase. The guide rigidity of the shaftless OE spinning rotors known up to now was insufficient, so that there were critical speed ranges with impermissible wobbling and oscillating movements. At very high speeds, there were also rotor breaks because the holding forces for the drive magnets used in the recesses of the spinning rotor could no longer be absorbed by the rotor walls in addition to their internal centrifugal stresses.

Aufgabe der Erfindung ist es, diese Nachteile zu beseitigen und einen schaftlosen OE-Spinnrotor für ein Axialgaslager mit hoher Führungssteifigkeit und einer bis in die höchsten Bereiche drehzahlfesten Halterung der Antriebsmagnete bei möglichst kleiner Masse und niedrigem Trägheitsmoment zu schaffen.The object of the invention is to eliminate these disadvantages and to provide a shaftless OE spinning rotor for an axial gas bearing with high guide rigidity and a mounting of the drive magnets which is rotationally fixed up to the highest ranges with the smallest possible mass and low moment of inertia.

Der OE-Spinnrotor gemäß Oberbegriff des Anspruches 1 erfüllt diese Aufgabe durch die kennzeichnenden Merkmale des Anspruches 1. Die erforderliche Führungssteifigkeit wird durch die Kombination aus Haltemagneten und Zentriermagneten und die fliehkraftfeste Verankerung der Magnete durch ihre Fixierung mit einem hochfesten Material erzielt, wobei die Verwendung dielektrischer kohlefaserverstärkter Laminate besonders vorteilhaft ist.The OE spinning rotor according to the preamble of claim 1 fulfills this task by the characterizing features of claim 1. The required guide rigidity is achieved by the combination of holding magnets and centering magnets and the centrifugal anchorage of the magnets by fixing them with a high-strength material, the use of dielectric carbon fiber reinforced laminates is particularly advantageous.

Deren hohe Oberflächengüte garantiert gleichzeitig eine geringe Lagerverlustleistung und ihre geringe Masse bei gleichzeitiger hoher Festigkeit ein niedriges Trägheitsmoment.Their high surface quality simultaneously guarantees low bearing power loss and their low mass combined with high strength and low moment of inertia.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels näher erläutert.The invention is explained in more detail below using an exemplary embodiment.

Es zeigen:

Fig. 1
Schnitt durch OE-Spinnrotor mit miteinander verklebtem Spinnteil und Antriebsteil;
Fig. 2
schematische Draufsicht auf das Antriebsteil;
Fig. 3
Distanzteil, das zwischen die Antriebsmagnete eingebaut wird;
Fig. 4
Detailausschnitt aus dem Zentrum des Antriebsteils.
Show it:
Fig. 1
Section through OE spinning rotor with glued spinning part and drive part;
Fig. 2
schematic plan view of the drive part;
Fig. 3
Spacer that is installed between the drive magnets;
Fig. 4
Detail from the center of the drive part.

Der schaftlose OE-Spinnrotor, wie im Schnitt in der Figur 1 dargestellt, trägt die passiven Elemente für den Antrieb und die Elemente für die Lagerung auf einem kombinierten Magnet-Gaslager, Dazu gehören in seiner Antriebsseite 2 die Kombination eines scheibenförmigen Permanentmagneten 3 als Haltemagnet und eines konzentrisch zu diesem angeordneten ringförmigen Permanentmagneten 4 als Zentriermagnet, die durch einen Distanzring 5 magnetisch getrennt sind. Um eine besonders wirksame Zentrierung zu erreichen, können auch zwei konzentrische Permanentmagnete 4, die ebenfalls durch einen Distanzring 5 getrennt sind, vorgesehen sein.The shaftless OE spinning rotor, as shown in the section in FIG. 1, carries the passive elements for the drive and the elements for storage on a combined magnetic gas bearing. In its drive side 2, this includes the combination of a disk-shaped permanent magnet 3 as a holding magnet and an annular permanent magnet arranged concentrically to this 4 as a centering magnet, which are magnetically separated by a spacer ring 5. In order to achieve a particularly effective centering, two concentric permanent magnets 4, which are also separated by a spacer ring 5, can also be provided.

Die Halte- und Zentriermagnete, d.h., die Permanentmagnete 3 und 4, werden angezogen von deckungsgleichen Permanentmagneten entgegengesetzter Polarität in einer nicht dargestellten Vorrichtung zum Antrieb und Lagern des schaftlosen OE-Spinnrotors. Diese Permanentmagnete sind also paarweise zueinander angeordnet. Der Abstand zwischen diesen Paaren wird von einem Lagerspalt des kombinierten Magnet-Gaslagers gebildet. Die Außenfläche des OE-Spinnrotors auf der Antriebsseite 2 bildet eine sehr glatte Lagerfläche 6 aus mehrfach geschichteten Laminaten 7a, die durch Kohlefasern wechselnder Faserrichtung 8 verstärkt sind.The holding and centering magnets, i.e. permanent magnets 3 and 4, are attracted by congruent permanent magnets of opposite polarity in a device, not shown, for driving and supporting the shaftless OE spinning rotor. These permanent magnets are therefore arranged in pairs to one another. The distance between these pairs is formed by a bearing gap of the combined magnetic gas bearing. The outer surface of the OE spinning rotor on the drive side 2 forms a very smooth bearing surface 6 made of multi-layer laminates 7a, which are reinforced by carbon fibers 8 changing fiber direction.

Um die im Zentrum des Antriebsteiles 2 angeordneten Permanentmagnete 3, 4 sind im äußeren Bereich des Antriebsteiles 2 dünne Permanentmagnete 9 paarweise, punktsymmetrisch und mit wechselnder Polarität als Antriebsmagnete angeordnet. Diese Antriebsmagnete sind vorzugswiese als Segmente ausgebildet, deren Enden 10 radial verlaufen oder bogenförmig geneigt sind.Around the permanent magnets 3, 4 arranged in the center of the drive part 2, thin permanent magnets 9 are arranged in pairs, point symmetrically and with changing polarity as drive magnets in the outer region of the drive part 2. These drive magnets are preferably formed as segments, the ends 10 of which extend radially or are curved in an arc.

Direkt axial diesen Permanentmagneten 9 gegenüber befindet sich der Stator des Axialfeldmotors (nicht dargestellt), der den OE-Spinnrotor antreibt. Sein Antriebsfeld greift in die Permanentmagnete 9 und schließt sich in einem Joch, als das der Boden 11 des Spinnrotors 1 wirkt (Fig. 1).Directly axially opposite these permanent magnets 9 is the stator of the axial field motor (not shown), which drives the OE spinning rotor. Its drive field engages in the permanent magnets 9 and closes in a yoke, as the bottom 11 of the spinning rotor 1 acts (Fig. 1).

Im Ausführungsbeispiel ist ein inneres Distanzformteil 14 (Fig. 3) hoher Festigkeit radial zwischen den Magneten 3, 4 und den Magneten 9 mit gleicher Dicke wie die Magnete 3, 4, 9 und mit den Formen dieser Magnete entsprechenden Aussparungen 16, 17 eingebracht. Das Distanzformteil 14 kann auch aus kohlefaserverstärkten Laminaten mit wechselnder Faserrichtung 15 bestehen. Damit braucht das Laminat 7a nicht zusätzlich zu den Fliehkräften der Antriebsmagnete 9 noch solche des Distanzformteiles 14 aufzunehmen.In the exemplary embodiment, an inner spacer molding 14 (FIG. 3) of high strength is introduced radially between the magnets 3, 4 and the magnets 9 with the same thickness as the magnets 3, 4, 9 and recesses 16, 17 corresponding to the shapes of these magnets. The Spacer molding 14 can also consist of carbon fiber reinforced laminates with changing fiber direction 15. Thus, the laminate 7a does not have to take up the centrifugal forces of the drive magnets 9 or those of the spacer 14.

Über alle Magnete 3, 4, 9 und das Distanzformteil 14 erstrecken sich kreisscheibenförmige feste Laminate 7a, 7b, die auch bei höchsten Drehzahlen die Magnete und das Distanzformteil sicher halten. Es ist zweckmäßig, daß der OE-Spinnrotor auf seinem Außenumfang Markierungen (18) trägt zur Erfassung der Rotorstellung mittels Sensoren, wenn der OE-Spinnrotor durch einen kollektorlosen Axialfeldmotor angetrieben wird.Circular disk-shaped fixed laminates 7a, 7b extend over all magnets 3, 4, 9 and the spacer molding 14 and hold the magnets and the spacing molding securely even at the highest speeds. It is expedient that the OE spinning rotor has markings (18) on its outer circumference for detecting the rotor position by means of sensors if the OE spinning rotor is driven by a brushless axial field motor.

Claims (5)

  1. Shaftless open-end spinning rotor which is designed as a rotor of an axial-field motor, with a plane-parallel bearing face for a combined magnetic/gas bearing which is integrated into the stator end face of an axial-field motor, and with magnets for guidance and drive, characterized in that thin, concentric disc-shaped annular permanent magnets (3, 4), in each case with alternating polarity, between which a concentric, magnetically non-conductive spacer ring (5) is arranged, are located for guidance in the centre of the drive side (2) of the spinning rotor (1) and, for the drive of the latter, thin permanent magnets (9) are arranged in the outer region in pairs, point-symmetrically and with alternating polarity, and in that all the magnets (3, 4, 9) are held on the spinning rotor (1) by a high-strength material.
  2. Open-end spinning rotor according to Claim 1, characterized in that all the magnets (3, 4, 9) are adhesively bonded and held externally, at least on one side, by means of material consisting of preferably carbon-fibre-reinforced, multiply layered laminates (7a, 7b), and an inner spacer moulding (14) of high strength is introduced radially between the magnets (3, 4) and the magnets (9), with the same thickness as the magnets (3, 4, 9) and with recesses (16, 17) corresponding to the magnet shapes, the layers being laid in the outer laminates (7a, 7b) in the form of circular discs, with a fibre direction (8) which changes in such a way that the main tensile-strength direction extends over the zone of the permanent magnets (9).
  3. Open-end spinning rotor according to one of Claims 1 or 2, characterized in that the spinning part (1) consisting of ferromagnetic material and the driving part (2) are adhesively bonded with one another, and the bottom (11) of the spinning part (1) serves as a yoke for closing the main magnetic field of the motor.
  4. Open-end spinning rotor according to one of Claims 1 to 3, characterized in that the permanent magnets (5) serving as driving magnets are designed as segments, the ends (10) of which extend radially or are inclined arcuately.
  5. Open-end spinning rotor according to one of Claims 1 to 4, characterized in that, when the open-end spinning rotor is used on a commutatorless axial-field motor, the open-end spinning rotor carries markings (18) for recording the rotor position by means of sensors.
EP91912504A 1990-07-10 1991-07-09 Shaftless open-end spinning rotor of an axial combined magnetic/gas bearing Expired - Lifetime EP0538311B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9002397 1990-07-10
SE9002397A SE467212B (en) 1990-07-10 1990-07-10 AXELLOES OEPPEN-Duck SPINNROTOR
PCT/EP1991/001276 WO1992001097A1 (en) 1990-07-10 1991-07-09 Shaftless open-end spinning rotor of an axial combined magnetic/gas bearing

Publications (2)

Publication Number Publication Date
EP0538311A1 EP0538311A1 (en) 1993-04-28
EP0538311B1 true EP0538311B1 (en) 1995-05-24

Family

ID=20379974

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91912504A Expired - Lifetime EP0538311B1 (en) 1990-07-10 1991-07-09 Shaftless open-end spinning rotor of an axial combined magnetic/gas bearing

Country Status (4)

Country Link
EP (1) EP0538311B1 (en)
DE (1) DE59105600D1 (en)
SE (1) SE467212B (en)
WO (1) WO1992001097A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4342583A1 (en) * 1993-12-14 1995-06-22 Skf Textilmasch Komponenten Shaftless rotor for open end spinner
DE4342539A1 (en) * 1993-12-14 1995-06-22 Skf Textilmasch Komponenten Shaftless rotor for open end spinning
DE4342584A1 (en) * 1993-12-14 1995-06-22 Skf Textilmasch Komponenten Motor drive useful esp. for shaftless open end spinning rotor
DE4409993A1 (en) * 1994-03-23 1995-09-28 Skf Textilmasch Komponenten Electric drive using axial field motor with magnetic gas bearing
EP0687827A1 (en) * 1994-06-13 1995-12-20 Mechanical Technology Incorporated Hybrid magnetic/foil gas bearings
DE4441087A1 (en) * 1994-11-18 1996-05-23 Rieter Ingolstadt Spinnerei Open-end spinning device
DE69517175T2 (en) * 1995-10-13 2001-01-25 D I E N E S App Bau Gmbh High speed reel
DE102008008854A1 (en) * 2008-02-13 2009-08-20 Oerlikon Textile Gmbh & Co. Kg axial bearing

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2640111C2 (en) * 1976-09-07 1984-12-06 Teldix Gmbh, 6900 Heidelberg OE rotor spinning unit
DE3000357C2 (en) * 1980-01-07 1982-12-30 Arthur Pfeiffer Vakuumtechnik Wetzlar Gmbh, 6334 Asslar Mechanical auxiliary bearing for magnetic storage
SE453419B (en) * 1985-02-04 1988-02-01 Skf Nova Ab DEVICE WITH AXIAL LAYERS WHICH STORAGE SITES INCLUDE MAGNETIC PARTIES

Also Published As

Publication number Publication date
EP0538311A1 (en) 1993-04-28
SE9002397L (en) 1992-01-11
DE59105600D1 (en) 1995-06-29
SE9002397D0 (en) 1990-07-10
SE467212B (en) 1992-06-15
WO1992001097A1 (en) 1992-01-23

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